//!
//! termcolor
//! ~~~~~~~~~
//!
//! termcolor is a header-only c++ library for printing colored messages
//! to the terminal. Written just for fun with a help of the Force.
//!
//! :copyright: (c) 2013 by Ihor Kalnytskyi
//! :license: BSD, see LICENSE for details
//!

#ifndef TERMCOLOR_HPP_
#define TERMCOLOR_HPP_

#include <iostream>

// Detect target's platform and set some macros in order to wrap platform
// specific code this library depends on.
#if defined(_WIN32) || defined(_WIN64)
#define TERMCOLOR_TARGET_WINDOWS
#elif defined(__unix__) || defined(__unix) ||                                  \
    (defined(__APPLE__) && defined(__MACH__))
#define TERMCOLOR_TARGET_POSIX
#endif

// If implementation has not been explicitly set, try to choose one based on
// target platform.
#if !defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES) &&                           \
    !defined(TERMCOLOR_USE_WINDOWS_API) && !defined(TERMCOLOR_USE_NOOP)
#if defined(TERMCOLOR_TARGET_POSIX)
#define TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES
#define TERMCOLOR_AUTODETECTED_IMPLEMENTATION
#elif defined(TERMCOLOR_TARGET_WINDOWS)
#define TERMCOLOR_USE_WINDOWS_API
#define TERMCOLOR_AUTODETECTED_IMPLEMENTATION
#endif
#endif

// These headers provide isatty()/fileno() functions, which are used for
// testing whether a standard stream refers to the terminal.
#if defined(TERMCOLOR_TARGET_POSIX)
#include <unistd.h>
#elif defined(TERMCOLOR_TARGET_WINDOWS)
#include <io.h>
#include <windows.h>
#endif

namespace termcolor {
// Forward declaration of the `_internal` namespace.
// All comments are below.
namespace _internal {
inline int colorize_index();
inline FILE *get_standard_stream(const std::ostream &stream);
inline FILE *get_standard_stream(const std::wostream &stream);
template <typename CharT> bool is_colorized(std::basic_ostream<CharT> &stream);
template <typename CharT> bool is_atty(const std::basic_ostream<CharT> &stream);

#if defined(TERMCOLOR_TARGET_WINDOWS)
template <typename CharT>
void win_change_attributes(std::basic_ostream<CharT> &stream, int foreground,
                           int background = -1);
#endif
} // namespace _internal

template <typename CharT>
std::basic_ostream<CharT> &colorize(std::basic_ostream<CharT> &stream) {
  stream.iword(_internal::colorize_index()) = 1L;
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &nocolorize(std::basic_ostream<CharT> &stream) {
  stream.iword(_internal::colorize_index()) = 0L;
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &reset(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[00m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1, -1);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bold(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[1m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &dark(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[2m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &italic(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[3m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &underline(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[4m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1, COMMON_LVB_UNDERSCORE);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &blink(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[5m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &reverse(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[7m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &concealed(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[8m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &crossed(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[9m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <uint8_t code, typename CharT>
std::basic_ostream<CharT> &color(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[38;5;" << +code << "m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <uint8_t code, typename CharT>
std::basic_ostream<CharT> &on_color(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[48;5;" << +code << "m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <uint8_t r, uint8_t g, uint8_t b, typename CharT>
std::basic_ostream<CharT> &color(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[38;2;" << +r << ";" << +g << ";" << +b << "m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <uint8_t r, uint8_t g, uint8_t b, typename CharT>
std::basic_ostream<CharT> &on_color(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[48;2;" << +r << ";" << +g << ";" << +b << "m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &grey(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[30m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     0 // grey (black)
    );
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &red(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[31m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &green(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[32m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_GREEN);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &yellow(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[33m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_GREEN | FOREGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &blue(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[34m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_BLUE);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &magenta(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[35m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_BLUE | FOREGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &cyan(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[36m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     FOREGROUND_BLUE | FOREGROUND_GREEN);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &white(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[37m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_grey(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[90m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     0 | FOREGROUND_INTENSITY // grey (black)
    );
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_red(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[91m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     FOREGROUND_RED | FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_green(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[92m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     FOREGROUND_GREEN | FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_yellow(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[93m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_GREEN | FOREGROUND_RED |
                                                 FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_blue(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[94m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     FOREGROUND_BLUE | FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_magenta(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[95m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, FOREGROUND_BLUE | FOREGROUND_RED |
                                                 FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_cyan(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[96m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &bright_white(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[97m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream,
                                     FOREGROUND_BLUE | FOREGROUND_GREEN |
                                         FOREGROUND_RED | FOREGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_grey(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[40m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     0 // grey (black)
    );
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_red(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[41m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1, BACKGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_green(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[42m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1, BACKGROUND_GREEN);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_yellow(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[43m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_GREEN | BACKGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_blue(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[44m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1, BACKGROUND_BLUE);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_magenta(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[45m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_BLUE | BACKGROUND_RED);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_cyan(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[46m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_GREEN | BACKGROUND_BLUE);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_white(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[47m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, -1, BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_RED);
#endif
  }

  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_grey(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[100m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     0 | BACKGROUND_INTENSITY // grey (black)
    );
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_red(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[101m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_RED | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_green(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[102m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_GREEN | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_yellow(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[103m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, -1, BACKGROUND_GREEN | BACKGROUND_RED | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_blue(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[104m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_BLUE | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &
on_bright_magenta(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[105m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, -1, BACKGROUND_BLUE | BACKGROUND_RED | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_cyan(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[106m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(
        stream, -1, BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY);
#endif
  }
  return stream;
}

template <typename CharT>
std::basic_ostream<CharT> &on_bright_white(std::basic_ostream<CharT> &stream) {
  if (_internal::is_colorized(stream)) {
#if defined(TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES)
    stream << "\033[107m";
#elif defined(TERMCOLOR_USE_WINDOWS_API)
    _internal::win_change_attributes(stream, -1,
                                     BACKGROUND_GREEN | BACKGROUND_BLUE |
                                         BACKGROUND_RED | BACKGROUND_INTENSITY);
#endif
  }

  return stream;
}

//! Since C++ hasn't a way to hide something in the header from
//! the outer access, I have to introduce this namespace which
//! is used for internal purpose and should't be access from
//! the user code.
namespace _internal {
// An index to be used to access a private storage of I/O streams. See
// colorize / nocolorize I/O manipulators for details. Due to the fact
// that static variables ain't shared between translation units, inline
// function with local static variable is used to do the trick and share
// the variable value between translation units.
inline int colorize_index() {
  static int colorize_index = std::ios_base::xalloc();
  return colorize_index;
}

//! Since C++ hasn't a true way to extract stream handler
//! from the a given `std::ostream` object, I have to write
//! this kind of hack.
inline FILE *get_standard_stream(const std::ostream &stream) {
  if (&stream == &std::cout)
    return stdout;
  else if (&stream == &std::cerr || &stream == &std::clog)
    return stderr;

  return nullptr;
}

//! Since C++ hasn't a true way to extract stream handler
//! from the a given `std::wostream` object, I have to write
//! this kind of hack.
inline FILE *get_standard_stream(const std::wostream &stream) {
  if (&stream == &std::wcout)
    return stdout;
  else if (&stream == &std::wcerr || &stream == &std::wclog)
    return stderr;

  return nullptr;
}

// Say whether a given stream should be colorized or not. It's always
// true for ATTY streams and may be true for streams marked with
// colorize flag.
template <typename CharT> bool is_colorized(std::basic_ostream<CharT> &stream) {
  return is_atty(stream) || static_cast<bool>(stream.iword(colorize_index()));
}

//! Test whether a given `std::ostream` object refers to
//! a terminal.
template <typename CharT>
bool is_atty(const std::basic_ostream<CharT> &stream) {
  FILE *std_stream = get_standard_stream(stream);

  // Unfortunately, fileno() ends with segmentation fault
  // if invalid file descriptor is passed. So we need to
  // handle this case gracefully and assume it's not a tty
  // if standard stream is not detected, and 0 is returned.
  if (!std_stream)
    return false;

#if defined(TERMCOLOR_TARGET_POSIX)
  return ::isatty(fileno(std_stream));
#elif defined(TERMCOLOR_TARGET_WINDOWS)
  return ::_isatty(_fileno(std_stream));
#else
  return false;
#endif
}

#if defined(TERMCOLOR_TARGET_WINDOWS)

//! same hack as used in get_standard_stream function, but for Windows with
//! `std::ostream`
inline HANDLE get_terminal_handle(std::ostream &stream) {
  if (&stream == &std::cout)
    return GetStdHandle(STD_OUTPUT_HANDLE);
  else if (&stream == &std::cerr || &stream == &std::clog)
    return GetStdHandle(STD_ERROR_HANDLE);
  return nullptr;
}

//! same hack as used in get_standard_stream function, but for Windows with
//! `std::wostream`
inline HANDLE get_terminal_handle(std::wostream &stream) {
  if (&stream == &std::wcout)
    return GetStdHandle(STD_OUTPUT_HANDLE);
  else if (&stream == &std::wcerr || &stream == &std::wclog)
    return GetStdHandle(STD_ERROR_HANDLE);
  return nullptr;
}

//! Change Windows Terminal colors attribute. If some
//! parameter is `-1` then attribute won't changed.
template <typename CharT>
void win_change_attributes(std::basic_ostream<CharT> &stream, int foreground,
                           int background) {
  // yeah, i know.. it's ugly, it's windows.
  static WORD defaultAttributes = 0;

  // Windows doesn't have ANSI escape sequences and so we use special
  // API to change Terminal output color. That means we can't
  // manipulate colors by means of "std::stringstream" and hence
  // should do nothing in this case.
  if (!_internal::is_atty(stream))
    return;

  // get terminal handle
  HANDLE hTerminal = INVALID_HANDLE_VALUE;
  hTerminal = get_terminal_handle(stream);

  // save default terminal attributes if it unsaved
  if (!defaultAttributes) {
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(hTerminal, &info))
      return;
    defaultAttributes = info.wAttributes;
  }

  // restore all default settings
  if (foreground == -1 && background == -1) {
    SetConsoleTextAttribute(hTerminal, defaultAttributes);
    return;
  }

  // get current settings
  CONSOLE_SCREEN_BUFFER_INFO info;
  if (!GetConsoleScreenBufferInfo(hTerminal, &info))
    return;

  if (foreground != -1) {
    info.wAttributes &= ~(info.wAttributes & 0x0F);
    info.wAttributes |= static_cast<WORD>(foreground);
  }

  if (background != -1) {
    info.wAttributes &= ~(info.wAttributes & 0xF0);
    info.wAttributes |= static_cast<WORD>(background);
  }

  SetConsoleTextAttribute(hTerminal, info.wAttributes);
}
#endif // TERMCOLOR_TARGET_WINDOWS

} // namespace _internal

} // namespace termcolor

#undef TERMCOLOR_TARGET_POSIX
#undef TERMCOLOR_TARGET_WINDOWS

#if defined(TERMCOLOR_AUTODETECTED_IMPLEMENTATION)
#undef TERMCOLOR_USE_ANSI_ESCAPE_SEQUENCES
#undef TERMCOLOR_USE_WINDOWS_API
#endif

#endif // TERMCOLOR_HPP_
